1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/netwerk/srtp/src/crypto/include/prng.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,89 @@
1.4 +/*
1.5 + * prng.h
1.6 + *
1.7 + * pseudorandom source
1.8 + *
1.9 + * David A. McGrew
1.10 + * Cisco Systems, Inc.
1.11 + */
1.12 +/*
1.13 + *
1.14 + * Copyright (c) 2001-2006, Cisco Systems, Inc.
1.15 + * All rights reserved.
1.16 + *
1.17 + * Redistribution and use in source and binary forms, with or without
1.18 + * modification, are permitted provided that the following conditions
1.19 + * are met:
1.20 + *
1.21 + * Redistributions of source code must retain the above copyright
1.22 + * notice, this list of conditions and the following disclaimer.
1.23 + *
1.24 + * Redistributions in binary form must reproduce the above
1.25 + * copyright notice, this list of conditions and the following
1.26 + * disclaimer in the documentation and/or other materials provided
1.27 + * with the distribution.
1.28 + *
1.29 + * Neither the name of the Cisco Systems, Inc. nor the names of its
1.30 + * contributors may be used to endorse or promote products derived
1.31 + * from this software without specific prior written permission.
1.32 + *
1.33 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.34 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.35 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
1.36 + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
1.37 + * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
1.38 + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
1.39 + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
1.40 + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.41 + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
1.42 + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.43 + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
1.44 + * OF THE POSSIBILITY OF SUCH DAMAGE.
1.45 + *
1.46 + */
1.47 +
1.48 +#ifndef PRNG_H
1.49 +#define PRNG_H
1.50 +
1.51 +#include "rand_source.h" /* for rand_source_func_t definition */
1.52 +#include "aes.h" /* for aes */
1.53 +#include "aes_icm.h" /* for aes ctr */
1.54 +
1.55 +#define MAX_PRNG_OUT_LEN 0xffffffffU
1.56 +
1.57 +/*
1.58 + * x917_prng is an ANSI X9.17-like AES-based PRNG
1.59 + */
1.60 +
1.61 +typedef struct {
1.62 + v128_t state; /* state data */
1.63 + aes_expanded_key_t key; /* secret key */
1.64 + uint32_t octet_count; /* number of octets output since last init */
1.65 + rand_source_func_t rand; /* random source for re-initialization */
1.66 +} x917_prng_t;
1.67 +
1.68 +err_status_t
1.69 +x917_prng_init(rand_source_func_t random_source);
1.70 +
1.71 +err_status_t
1.72 +x917_prng_get_octet_string(uint8_t *dest, uint32_t len);
1.73 +
1.74 +
1.75 +/*
1.76 + * ctr_prng is an AES-CTR based PRNG
1.77 + */
1.78 +
1.79 +typedef struct {
1.80 + uint32_t octet_count; /* number of octets output since last init */
1.81 + aes_icm_ctx_t state; /* state data */
1.82 + rand_source_func_t rand; /* random source for re-initialization */
1.83 +} ctr_prng_t;
1.84 +
1.85 +err_status_t
1.86 +ctr_prng_init(rand_source_func_t random_source);
1.87 +
1.88 +err_status_t
1.89 +ctr_prng_get_octet_string(void *dest, uint32_t len);
1.90 +
1.91 +
1.92 +#endif
